Novel pickling solution for pretreating surfaces of aluminum and aluminum alloy

A technology for pickling liquid and aluminum alloy, which is applied in the field of surface pretreatment of aluminum and aluminum alloys, can solve the problems of surface corrosion of appliances, poor operating conditions, residual alkaline washing liquid, etc., and achieves reduced harm, long service life, and simple preparation method. Effect

Inactive Publication Date: 2014-11-19
BEIJING XINLI MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a new type of pickling solution for the surface pretreatment of aluminum and aluminum alloys, aiming at the problems of unclean cleaning, serious surface corrosion of appliances and poor operating conditions.
The novel aluminum and aluminum alloy surface pretreatment pickling liquid of the present invention is suitable for various aluminum and aluminum alloys, and can better solve the problem of residual alkali cleaning liquid and pickling liquid in the screw holes after the surface pretreatment of multi-blind screw holes. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: prepare 10L pickling solution

[0013] Add 5L of water into the container, then add 150mL of concentrated nitric acid at a ratio of 15mL / L, add 2L of hydrogen peroxide 500ml at a ratio of 200mL / L, then add water to 10L and stir evenly to obtain the pickling solution of the present invention.

[0014] Application: soak the multi-blind screw hole parts in the pickling solution of Example 1 at 30-35°C for 20 minutes. After taking out, the multi-blind screw hole parts have a smooth surface and no acid residue. Other multi-blind screw parts of the same batch soaked in strong acid solution are more durable.

Embodiment 2

[0015] Embodiment 2: prepare 100L pickling solution

[0016] Add 50L of water to the container, then add 700mL of concentrated nitric acid at a ratio of 7mL / L, add 10L of hydrogen peroxide at a ratio of 100mL / L, and add 500g of sodium nitrate at a ratio of 5g / L, then add water to 100L and stir evenly Obtain pickling solution of the present invention.

[0017] Application: Soak the multi-blind screw hole parts in the pickling solution of Example 2 at 20-25°C for 10 minutes. After taking out, the multi-blind screw hole parts have a smooth surface and no acid residue. Other multi-blind screw parts of the same batch soaked in strong acid solution are more durable.

Embodiment 3

[0018] Embodiment 3: prepare 50L pickling solution

[0019] Add 25L of water to the container, then add 2.5L of concentrated nitric acid at a ratio of 50mL / L, add 3.5L of hydrogen peroxide at a ratio of 70mL / L, and add 250g of potassium nitrate at a ratio of 5g / L, then add water to 50L and stir Uniformly obtain the pickling solution of the present invention.

[0020] Application: Soak the multi-blind screw hole parts in the pickling solution of Example 3 at 20-25°C for 0.5min. After taking out, the multi-blind screw hole parts have a smooth surface and no acid residue. Other multi-blind screw parts of the same batch soaked in strong pickling solution are more durable.

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PUM

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Abstract

The invention relates to a novel pickling solution for pretreating the surfaces of aluminum and aluminum alloy. The pickling solution comprises 7-50mL / L concentrated nitric acid, 50-200mL / L hydrogen peroxide and the balance of water. The novel pickling solution for pretreating the surfaces of aluminum and aluminum alloy is suitable for various kinds of aluminum and aluminum alloy and can be used for better solving the problem that an alkali washing solution and a pickling solution are left in screw holes after the surfaces of multi-blind screw hole parts are pretreated. After being verified for a long term, the pickling solution is relatively stable, suitable for large-scale production, free of any quality problem in an application period and capable of ensuring the success of a batch production task.

Description

technical field [0001] The invention relates to a novel lotion, in particular to a pickling solution for pretreatment of aluminum and aluminum alloy surfaces, and is mainly used in the technical field of pretreatment of aluminum and aluminum alloy surfaces. Background technique [0002] In terms of surface pretreatment of aluminum and aluminum alloys, there have been problems such as subsequent electroplating, corrosion of oxidized thread holes, and discoloration due to unclean cleaning with alkaline and pickling solutions. In the existing technology, the surface pretreatment of aluminum and aluminum alloys often needs to be reworked or repaired two to three times, or complex operations such as manual cleaning are added, which not only leads to a substantial increase in production costs and low production efficiency, but also the size of the parts is easy to be out of tolerance, and the surface The smoothness decreased significantly. In the face of increasing mass productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/12
Inventor 王志勇
Owner BEIJING XINLI MACHINERY
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